| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.2%
|
| 2 | 4 |
4.7%
|
|
| 3 | 8 |
9.4%
|
|
| 4 | 10 |
11.8%
|
|
| 5 | 17 |
20%
|
|
| 6 | 12 |
14.1%
|
|
| 7 | 15 |
17.6%
|
|
| 8 | 12 |
14.1%
|
|
| 9 | 4 |
4.7%
|
|
| 10 | Very effective | 2 |
2.4%
|
| -99 | 3 | ||
| 11 | Don't know | 19 | |
| Sysmiss | 2 |